<template>
  <div>
           <!-- 面包屑 -->
     <el-breadcrumb separator-class="el-icon-arrow-right">
         <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
         <el-breadcrumb-item>商品管理</el-breadcrumb-item>
         <el-breadcrumb-item>参数列表</el-breadcrumb-item>
      </el-breadcrumb>

       <!-- 卡片视图区 -->
       <el-card>

           <!-- 警告区域 -->
             <el-alert title="注意:只允许为第三级分类设置相关参数!" type="warning" :closable="false" show-icon></el-alert>

             <!-- 选中商品分类区 -->
             <el-row class="cat_opt">
                 <el-col>
                     <span>选择商品分类:</span>
                       <!-- 选择商品分类的级联选择框 -->
                         <el-cascader v-model="selectedCateKeys" :options="catalist" :props="{ expandTrigger: 'hover', value:'cat_id',label:'cat_name',children:'children' }" @change="handleChange"></el-cascader>
                 </el-col>
             </el-row>

                <!-- tab 页签区域 -->
               <el-tabs v-model="activeName" @tab-click="handleClick">

                   <!-- t添加动态参数的面板 -->
               <el-tab-pane label="动态参数" name="many">
                      <!-- 按钮 -->
                   <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>

                   <!--动态参数表格 -->
                   <el-table :data="manyTableDate" border stripe>

                       <!--展开行 -->
                       <el-table-column type="expand">
                           <template v-slot="scope">
                               <!--输入的文本框 -->
                               <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                               </el-input>
                               <!--添加按钮 -->
                               <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                               <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                           </template>
                       </el-table-column>
                        <!--索引列 -->
                       <el-table-column type="index"></el-table-column>
                       <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                       <el-table-column label="操作">
                           <template v-slot="scope">
                               <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                               <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                           </template>
                       </el-table-column>
                   </el-table>

               </el-tab-pane>

                   <!-- t添加静态属性的面板 -->
                   <el-tab-pane label="静态属性" name="only">
                   <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>

                     <el-table :data="onlyTablrDate" border stripe>
                         <!--展开行 -->
                       <el-table-column type="expand">
                           <template v-slot="scope">
                               <!--输入的文本框 -->
                               <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                               </el-input>
                               <!--添加按钮 -->
                               <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                               <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                           </template>
                       </el-table-column>
                        <!--索引列 -->
                       <el-table-column type="index"></el-table-column>
                       <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                       <el-table-column label="操作">
                           <template v-slot="scope"> 
                               <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                               <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                           </template>
                       </el-table-column>
                   </el-table>
               </el-tab-pane>
               </el-tabs>

       </el-card>


         <!-- 添加对话框 -->
       <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="30%"  @close="addDialogClosed">

           <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
           <el-form-item :label="titleText" prop="attr_name">
           <el-input v-model="addForm.attr_name"></el-input>
           </el-form-item>
           </el-form>

       <span slot="footer" class="dialog-footer">
       <el-button @click="addDialogVisible = false">取 消</el-button>
       <el-button type="primary" @click="addParams">确 定</el-button>
       </span>
       </el-dialog>

         <!-- 修改对话框 -->
       <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="30%"  @close="editDialogClosed">

           <el-form :model="editForm" :rules="addFormRules" ref="editFormRef" label-width="100px">
           <el-form-item :label="titleText" prop="attr_name">
           <el-input v-model="editForm.attr_name"></el-input>
           </el-form-item>
           </el-form>

       <span slot="footer" class="dialog-footer">
       <el-button @click="editDialogVisible = false">取 消</el-button>
       <el-button type="primary" @click="editParams">确 定</el-button>
       </span>
     </el-dialog>


  </div>
</template>

<script>
export default {
    name:'',
    data() {
        return {
            //商品分类列表
            catalist:[],

            //级联选择框双向绑定到的数组
            selectedCateKeys:[],
            
            //被激活的页签名称
            activeName:'many',

            //动态参数的数据
            manyTableDate:[],

            //静态参数的数据
            onlyTablrDate:[],

            //对话框的显示与隐藏
            addDialogVisible:false,

            //添加数据的表单对象
            addForm:{
                attr_name:''
            },

            //添加表单的验证规则对象
            addFormRules:{
                attr_name:[{required:true,message:'请输入参数名称',trigger:'blur'}]
            },

            //修改对话框的显示与隐藏
            editDialogVisible:false,


            //修改的表单数据对象
            editForm:{},

        }
    },
    created() {
        this.getCateList()
    },

    methods: {
       async getCateList(){
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status !== 200){
                return this.$message.error("获取商品分类失败!")
            }
            this.catalist=res.data
        },

        //级联选择框中项变化，会触发这个函数
        handleChange(){
          this.getParamsData()
        },

        //获取参数的列表数据
       async getParamsData(){
           //证明选中的不是三级分类
            if(this.selectedCateKeys.length !==3){
                this.selectedCateKeys=[]
                this.manyTableDate=''
                this.onlyTablrDate=''
                return
            }

            //根据所选分类的id，和当前所处的面板，获取对应的参数
         const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})

         if(res.meta.status !==200){
             return this.$message.error("获取参数列表失败!")
         }
         
         res.data.forEach(item=>{
             item.attr_vals=item.attr_vals ? item.attr_vals.split(',') :[]
             //控制文本框的显示与隐藏
             item.inputVisible=false
             //文本框中输入的值
             item.inputValue=''
         })

         console.log(res.data);

         if(this.activeName === 'many'){
             this.manyTableDate = res.data
         }else{
             this.onlyTablrDate = res.data
         }
        },


        //tab页签点击事件处理函数
        handleClick(){
            this.getParamsData()
        },

        //监听对话框的对话事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },

        //点击按钮，添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid) return
               const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,
                {attr_name:this.addForm.attr_name,
                 attr_sel:this.activeName})
                  if(res.meta.status !== 201){
                return this.$message.error("增加参数失败!")
            }
                  this.$message.success("获取参数成功!")
                  this.getParamsData()
                  this.addDialogVisible=false
            })
        },

        //重置修改的表单
        editDialogClosed(){
             this.$refs.editFormRef.resetFields()
        },

        //打开修改对话框
       async showEditDialog(attr_id){
         const {data:res} = await   this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{params:{attr_sel:this.activeName}})
            if(res.meta.status !== 200){
                return this.$message.error("获取失败!")
            }
            this.editForm=res.data
            this.editDialogVisible=true
        },

        //点击按钮,修改参数
        editParams(){
            this.$refs.editFormRef.validate(async valid=>{
                if(!valid) return
              const {data:res} = await  this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
                {attr_name:this.editForm.attr_name,
                 attr_sel:this.activeName})
                  if(res.meta.status !== 200){
                return this.$message.error("修改失败!")
             }
                this.$message.success("修改成功!")
                this.getParamsData()
                this.editDialogVisible=false
            })
        },

        //根据id删除对应的参数
       async removeParams(attr_id){
         const confirmResult= await this.$confirm('此操作将永久删除该用户, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
            }
          ).catch(err=>{
              return err
          })

          //如果用户确认删除,返回confirm
          //如果用户确认删除,返回cancel
          if(confirmResult !== 'confirm'){
              return this.$message.info('已取消删除')
          }

            const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
               if(res.meta.status !== 200){
                   return this.$message.error("删除失败!")
             }
              this.$message.success("删除成功!")
              this.getParamsData()
              this.editDialogVisible=false
        },

        //按下回车鍵或失去焦点触发
        handleInputConfirm(row){
            if(row.inputValue.trim().length===0){
                row.inputValue=''
                row.inputVisible=false
                return
            }
            //如果没有retutn，则证明输入有内容，进行处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue=''
            row.inputVisible=false
            this.saveAttrVals(row)
           
        },

        //将对attr_vals的操作，保存到数据库
       async saveAttrVals(row){
            const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(',')
            })
            if(res.meta.status !== 200){
                return this.$message.error('修改失败!')
            }
            this.$message.success('修改成功!')
        },

        //点击按钮，显示输入框
        showInput(row){
            row.inputVisible=true
            //让文本框自动获得焦点
            this.$nextTick(_ => {
             this.$refs.saveTagInput.$refs.input.focus();
        });
        },

        //删除对应的参数项
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
    },


    computed:{

        //如果按钮需要被禁用，则返回true，否则返回false
        isBtnDisabled(){
            if(this.selectedCateKeys.length !==3){
                return true
            }
            return false
        },

        //当前选中的三级分类的id
        cateId(){
             if(this.selectedCateKeys.length ===3){
                 return this.selectedCateKeys[2]
             }
             return null
        },

        //动态计算标题的文本
        titleText(){
            if(this.activeName === 'many'){
                return '动态参数'
            }else{
                return '静态属性'
            }
        }
    }

}
</script>

<style>
.cat_opt{
    margin: 15px 0;
}
.input-new-tag{
    width: 120px;
}
</style>